Water → 4-(3-Cyano-6,6-dimethyl-11-oxo-6,11-dihydro-5H-benzo[b]carbazol-8-yloxy)-piperidine-1-carboxylic acid tert-butyl ester

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Reaction Steps

8-Hydroxy-6,6-dimethyl-11-oxo-6,11-dihydro-5H-benzo[b]carbazole-3-carbonitrile (Compound A6, 30 mg, 0.099 mmol) was dissolved in THF (1 mL), added with 4-hydroxy-piperidine-1-carboxylic acid tert-butyl ester (40 mg, 2 eq.), triphenylphosphine (52 mg, 2 eq.), and diisopropyl azodicarboxlyate (43 μL, 2 eq.) in order, and stirred at room temperature for 4 hr. The reaction solution was poured to water, and then extracted with ethyl acetate. The organic layer was washed with saturated brine and dried over sodium sulfate. The drying agent was removed by filtration and the residues obtained after concentration under reduced pressure were purified by silica gel column chromatography (ethyl acetate/hexane) to obtain the title compound (37 mg, 76%).

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